6738639 has 4 divisors (see below), whose sum is σ = 8984856. Its totient is φ = 4492424.

The previous prime is 6738631. The next prime is 6738649. The reversal of 6738639 is 9368376.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6738639 - 2³ = 6738631 is a prime.

It is a super-3 number, since 3×6738639³ (a number of 21 digits) contains 333 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 6738639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6738631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123104 + ... + 1123109.

It is an arithmetic number, because the mean of its divisors is an integer number (2246214).

Almost surely, 2^6738639 is an apocalyptic number.

6738639 is a deficient number, since it is larger than the sum of its proper divisors (2246217).

6738639 is a wasteful number, since it uses less digits than its factorization.

6738639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246216.

The product of its digits is 163296, while the sum is 42.

The square root of 6738639 is about 2595.8888651096. Note that the first 4 decimals coincide. The cubic root of 6738639 is about 188.8820685862.

The spelling of 6738639 in words is "six million, seven hundred thirty-eight thousand, six hundred thirty-nine".